Sun, 19 Jul 2009 19:20:17 +0200 wenzelm cancel_proofs: some attempts at reworking group management (based on body promises only);
Sun, 19 Jul 2009 18:42:05 +0200 wenzelm support for arbitrarity nested future proofs -- replaced crude order by explicit normalization (which might loop for bad dependencies);
Sun, 19 Jul 2009 18:02:40 +0200 wenzelm more abstract Future.is_worker;
Sun, 19 Jul 2009 17:08:34 +0200 wenzelm tuned;
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